Automatic safety cut-off for gas valves



' 1,6."z7'i2 May 3, :1927. c. BLUST 3 AUTOMATIC SAFETY CUT-OFF FOR GAS VALVES Filed Dec. 19. 1925 Patented May 3, 1927.

UNITED STATES PATENT oFEicE. j,

CHRISTIAN BLUST, OF ST. ALBANS, WEST VIRGINIA.

AUTOMATIC SAFETY CUT-OFF FOR GAS VALVES.`

Application filed December 19, 1925. Serial No. 76,491.

This invention relates to certain new-and useful improvements in an automatic safety cutoff for gas valves of the type wherein, a reduction in gas pressure iowing to an ignited burner or the like is followed by the closing and locking of a valve upon its seat to cut ofi' the supply of gas and to prevent opening movement of the valve upon a subsequent rise of gas pressure.'

The primary object of the invention is to provide an automatic safety cutoff for gas valves interposed in a gas line between a sourcev'of supply and a burner, heater or the like and embodying a spring pressed valve retained in an open position against spring pressure thereon by the flow of gas therethrough and adapted to be seated: by said spring when the pressure of the flow of gas becomes lower than the pressure of the spring and having means associated with the valve for locking the same on its seat to prevent opening movement thereof upon a subsequent rise in pressure of the gas.

With the above and other objects in view that will become apparent as the nature of the invention is better understood, the same consists of the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing and claimed.

In the drawing, wherein like reference characters indicate corresponding parts throughout the several views,

`Figure 1 is a side elevational view of an automatic safety gas cutoff valve for "a heater, burner or the like,

Figure 2 is a cross-sectional view taken on line 2 2 of Fig. 1 vshowing the circular series of gas entrance openings in the outer end of the valve casing,

Figure 3 is a cross-sectional view taken `on line 3*?) of Fig. 1 showing the pin and bayonet slot associated with the valve for retaining the same locked on its seat,

Figure 4 is a longitudinal sectional view showing the spring pressed valve closed on its seat under influence of the spring associated therewith, and i Figure 5 is a longitudinal sectional view, similar to Fig. 4 showing the valve unseated in the tension of the spring by gas pressure.

Referring more in detail to the accompanying drawing, wherein is illustrated a preferred embodiment of the invention, the reference numeral 1 designates the valve casing of tubular formation asshown in Figs. 4 and 5 and having reduced ends 2 and 3, the end 2 being externally threaded as at 4 and internally threaded at 5, while ythe opposite reduced end 2 is externally threaded. at 6 and provided with `axially of the valve casing while said seat 11 is provided with a circular series of longitudinally extending openings 13 disposed adjacent the base of the cone seat 11 as illustrated. i

A cylindrical valve 14 having an axial bore 1 5 therethrough is slid-able in the bore 16 of the valve casing 1 and the end thereof adjacent the conical valve seat 11 is formed with a conical recess or cavity 17 coincident eny to the conical face of the valve seat and to intimately engage the same and overlie the openings 13 for causing passageto the valve vas shown in Fig. 4 with the apex 12 of the valve seat received in the bore 15` of the valve 14.

A coil spring 18 within the valve casing 1 engages the inner end of thek valve 14 'and said spring is placed under tension by the stud screw 19 having the externally threaded shouldered end thereof engaging the internal threads 5 on the reduced end 2 of the valve casing, the adjacent end of the roil spring 18 enclosing the conical extension 2O ofthe stud screw and engaging said shoulder, the stud screw having acentral longitudinal opening 21 extending therethrough. The tension of the spring 18 may be regulated by adjustments of the stud screw 19.

Means associated with the valve casing 1 and valve 14 operate to hold the valve 14 locked upon its seat 11 and includes the provision of a bayonet slot extending through the side wall of the casing 1, the cross slot 22 communicating with the longitudinal slot 23 as shown in Fig. 1 with the side wall of the valve 14 closing the inner side of said slot.v A pin 24 having a weighted head 25 at its outer end extends through the bayonet slot and has a threaded connection 2G with a side wall of the valve 14 as shown in Fig. 3.

lhen the valve 14 is in its open position as shown in Fig. 5, the pin 24 is disposed in the longitudinal horizontal slot 23 as illustrated by dotted lines in Fig. 1 and with the valve 14 so positioned and removed from its seat 11, the liow of gas received from the supply pipe 8 passes through the openings 13 in the valve seat, the bore 15 of the valve 14, the bore 21 of the stud screw 19- for discharge into the service pipe 10. It is to be assumed that the mea-n pressure of the gas will be suliicient to overcome the power of the spring 18y for unseating the valve 14, but should the pressure of gas fall while a burner is ignited with a small flame, or the supply of gas through the pipe 8 temporarily cease, the spring 18 will move the valve 14 toward its seat 11 with the conical recess 17 in the outer end of the valve receiving the conical valve seat and closing the passages 13 t-hrough the valve seat. llVhen so disposed, the weighted outer end of the pin 24 will cause said pin to move downwardly and be disposed in the transverse or vertical leg 22 of the bayonet slot to lock the valve 14 upon its seat so that in the event of av rise of gas pressure in the pipe 8 with a burner associated with the service pipe 10 in an open position, the flow of gas through the valve will be prevented with the valve 14 securely locked upon its seat. j

While there is herein shown and described i the preferred embodiment of the present invention, it is, nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

What isclamed is 1. In an automatic safety valve for ygas burners, a valve casing, an apertured valve vseat at one end of the casing, and a tensioned valve having a central opening slidable in the casing, adapted to be held unseated by the flow of gas through the casing and adapted to be spring seated when the flow of gas is reduced to close the seat apertures, said seat being of conical formation with the apertures adjacent the base of the cone and the adjacent end of the valve having a conical socket to receive the seat.

2. In an automatic safety valve for gas burners, a valve casing, an apertured valve seat at one end of the casing, a tensioned valve having acentral opening slidable in the casing, adapted to be held unseated by the flow of gas through the casing and adapted to be spring .seated when the floiv of .gas 1s reduced to close the seat apertures, .said seat being of conical formation with the apertures adjacent the base of the cone and the adjacent end ofthe valve having a conical socket to receive the seat, and means for locking the valve on its seat.

3. In an automatic safety valve for gas burners, a valve casing, an apertured valve seat at one end of the casing, a tensioned valve having a -central `opening slidable in the casing, adapted to be held unseated by the fiow of gas through the casing and adapted tobe spring seated when the `flow of gas is reduced to close the seat apertures, said seat being ofl conical formation with the apertures-adjacent the base of the cone and the adjacentend of the valve having a conical socket to receive the seat, and a stud screw adjustably mounted in the other `end of the casing engaging the spring vto vary tension thereon.

4. In an automatic safety valve for gas burners, a valve casing, an apertured valve seat at one end of the casing, a tensioned valve having a central opening slidable in the casing, adapted to be held unseated by the flow of gas through the casing and adapted to be spring seated when the liow of gas is reduced to close the seat apertures, ,said yseat being of conical yformation with the apertures adjacent the base of thecone and the adjacent end ofthe valve .having a conical socket to receive the seat, means yfor locking the valve on .its seat, and a stud v the casing, adapted to be held -unseated by .the flow of gas through the casing. and adapted to be spring seated `when Ythe yflow of gas is reduced to close the seat apertures, ,said casing having a bayonet slot in Aitsside wall and a weighted pin extending through the slot and carried by the valve tolock said valve on its seat when moved by the .spring to its closed position.

6.y In an automatic safety valve for as burners, a valve casing, an apertured va ve seat at one end of the casing, a tensioned valve having a `central opening slidable in the casing, adapted to be held unseated by the flow of gas through the casing and adapted to be spring seated when the flow i 7. In an automatic safety valve for gas y burners, a valve casing having reduced threaded ends, one of said ends being closed, an inwardly directed conical stud on the closed end having a circular series 'of openings extending therethrough and forming a valve seat, a cylindrical valve having an axial opening and a conical recess in one end to receive the valve seat slidable in the casing, a coil Spring in the casing to engage 10 the other end of the valve, an adjustable stud screw in the casing en aging the other end of the spring to vary t e tension thereon said casing having a bayonet slot in its si e wall and a Weighted pin extending throu h the slot and carried by the valve to loc said valve on its seat when moved by the spring to its closed position.

In testimony whereof I aiix my signature.

CHRISTIAN BLUST. 

